David Hopewell, Senior Archaeologist for the Gwynedd Archaeolgical Trust, who carried out the survey, said: “Fortlets are smaller versions of Roman forts and are often found at significant points on Roman roads or at lookout points.

David Hopwell of GAT with analytical equipment

“The results of the geophysical survey were unusually clear as they showed the unmistakable outline of a Roman fortlet and faint traces of rectangular buildings that are most probably barracks.”

The results will now be included in the fourth of Gwynedd Archaeological Trust’s winter lectures.

This will be delivered by Mr Hopewell on Wednesday December 2 at the Telford Centre, Menai Bridge and is entitled “Post-medieval roads and their archaeology, with an update on Roman discoveries on Anglesey.”